JP2006021182A - Combined sewage treatment tank and grease trap tank using thinning material as filter medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that, in the conventional combined sewage treatment tank and a grease trap tank, though purification has been performed by passing through respective tanks such as first and second precipitation tanks, a contact aerator tank, a precipitation chamber and a sterilization tank, they have been separated into the respective tanks, thus a wide space has been required, and further, that maintenance of a filter medium in the contact aeration tank and treatment of precipitates such as sludge in the respective tanks have been needed. <P>SOLUTION: Filter medium obtained by working a thinning material into a chip shape is used as contact filter medium, the chip filter medium is packed into a combined tank, and cylindrical pipes are fixedly installed inside the combined tank, thus, by the filter medium worked into the shape of the thinning material chips, biological treatment with aerobic, mesoaerobic and anaerobic bacteria can be efficiently performed. In this way, the combined treatment system by using a single tank is made possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention uses a wood chip using thinned wood in a combined treatment septic tank and grease trap tank as a contact filter medium, and is used as a filter bed for promoting the growth of aerobic, aerobic and anaerobic bacteria. The contact filter media that can improve the purification efficiency of each wastewater, combined treatment septic tank, grease trap tank.

  Wastewater discharged from households, hospitals, offices, etc. as purification facilities in areas where there are no rivers, etc., where sewage is discharged in adjacent areas, and where there is a wide area of sewerage facilities, etc. However, in recent years, it has become mandatory to set up a combined treatment septic tank that treats human wastewater and domestic wastewater in view of environmental pollution problems such as domestic wastewater being a source of pollution. It has been. However, it is a well-known fact that there are many pollution problems in rivers and groundwater. The cause of the bad odor of various wastewaters is that organic matter contained in the wastewater changes due to decomposition by anaerobic bacteria and decays. It is necessary to decompose and deodorize this malodorous substance.

  The tank currently used as a combined purification treatment tank is purified by passing through the layers of the first precipitation separation tank, the second precipitation separation tank, the contact back tank, the precipitation chamber, the disinfection tank, etc. inside the rectangular parallelepiped tank. We are promoting. In the first and second sedimentation separation tanks, the decomposition and purification of organic matter is promoted by the growth of anaerobic bacteria, and the solid substances separated and precipitated water and liquefied water are formed from the lower center in the tank. In order to prevent the inflow of floc, sewage is sent from the upper part to the contact back tank. The inside of the contact back tank is filled with a filter medium to be a filter bed for aerobic bacteria.

  In the first and second sedimentation tanks, sewage that has been decomposed and liquefied by the growth of anaerobic bacteria is fed into the contact tank, and plastic, non-woven fabric, synthetic fibers, string-like contact filter media, etc. are used. Thus, a slurry-like substance is formed by aerobic bacteria, and the organic matter is decomposed and propagated as a filter bed. In addition, a diffuser tube is arranged at the lower position of the contact filter medium, and air is sent by an externally installed blower to promote the growth of aerobic bacteria. By passing between the filter media, the organic matter in the sewage is decomposed and purified, and further separated into a floating floc and a sedimented floc in the sedimentation chamber, sent to the disinfection tank from the lower part of the partition plate, sterilized by chlorine and discharged. . However, about 40% to 60% of the BOD is fixed in the form of microbial cells and does not change to SS (suspension material), so the separation and decomposition treatment of sludge has been difficult.

  In addition, installation of grease trap tanks that play the role of filtration tanks for wastewater from stores that are said to contain a large amount of oil with high BOD and COD values discharged from food-related facilities It is obliged to run stores.

  Also, in the grease trap tank, partition plates are set up to form 3 tanks and 4 tanks inside the rectangular parallelepiped tank, and the filter medium formed in a non-woven fabric or mesh is placed in the middle of the tank to contain a large amount of oil. The oil content in the waste water is reduced by passing the waste water through the filter medium. However, due to the physical filtration method, the filter medium is clogged, and the oil component is stacked inside the tank, so cleaning and replacement must be performed frequently.

  In general households, daily wastewater of about 200 liters / person to 250 liters / person is discharged per day. The amount of wastewater is expected to change with little change going forward. Thus, in order to purify and drain a large amount of drainage without contamination as well as in a region where a wide-area sewer system is complete, a problem arises that a large space is required and the construction becomes large.

  In addition, as the conventional contact filter media, a material in which a string-like fiber is knitted, a contact filter media made of plastic, a non-woven fabric, a contact filter media processed with a synthetic fiber, or the like is used. However, since it is detachable, it is deformed due to a change in water pressure or the like, and the contact filter medium is clogged, resulting in inconvenience such as replacement, and the degree of maintenance becomes high.

  Precipitation flocs are generated in the first and second precipitation separation tanks and the contact back tank. However, about 40% to 60% of the BOD was fixed in the form of microbial cells, changed to SS (suspended material), became a sludge residue, and was difficult to separate and decompose.

  High-slurry wastewater, TN (total nitrogen), TP (total phosphorus) contained in general household wastewater that does not contain toxic metals, etc. and organic matter BOD, COD, and wash water discharged from food-related facilities Provided are a natural environment type combined treatment septic tank and grease trap tank that can be realized at a low cost and without any adverse effects on the environment by decomposing SS (floating matter), oil, and the like.

  Therefore, in view of the above problems, the present invention uses a filter medium obtained by crushing a thinned material into 5 cm to 7 cm and processing it into a chip shape without using conventional plastics, nonwoven fabrics, synthetic fibers, string-like contact filter media and the like. The volume of the contact filter medium processed into a chip shape is proportional to the cube of the thickness of the chip, greatly increasing the area of the contact filter medium and leading to the role of filtration. From the above, as compared with conventional inorganic and organic filter media, the area of anaerobic, medium, and aerobic filter beds is greatly increased, so that bacterial growth is promoted and purification efficiency is further enhanced.

  By using this thinning chip filter medium, the conventional anaerobic treatment by the first and second sedimentation separation tanks, the anaerobic filter bed, and the aerobic treatment by the contact back tank are unnecessary. Also, without using blower air diffuser, aerobic filter bed, anaerobic filter bed, etc. used for aerobic treatment, it is possible to treat with anaerobic, medium and aerobic bacteria in a single tank, eliminating the need for treatment of generated sludge .

  By installing the cylindrical tube in the merger tank in the vertical direction, the inflowing sewage and organic matter can be sequentially introduced into the lower part of the merger tank, and the decomposition efficiency of the entire tank can be improved.

  In the process in which organic matter is decomposed by microorganisms, about 40% to 60% of BOD must be fixed in the form of microbial cells, converted to suspended matter SS, and sludge must be separated and decomposed. However, by using thinned chip filter media, it becomes as follows. In the process of propagating and proliferating on this chip filter medium, sucrose (sucrose), glucose (glucose), etc. are positive for degradation, and both have spores in the central part of the microbial cells in vegetative cells, Bacteria can move around actively. In addition, germinate and divide and proliferate if there are nourishing, temperature and moisture conditions. The organic matter is decomposed while repeating the division and growth along with the function of such bacteria, so it is decomposed and purified without discharging sludge with a high water content, and it also suppresses the generation of scum and deodorizes and eliminates bad odors. Is possible. In addition to replenishing thinned chip material, it has become possible to provide a combined treatment septic tank and a grease trap tank that require little maintenance.

  In order to use ordinary contact filter media, there are problems in selecting the installation location, and the propagation of microorganisms and the decomposition of organic matter are not considered, but they are merely used as fillers or contact materials.

  However, the present invention pays attention to the porous chamber property of the chip material that should correspond to the above-mentioned actual situation, and increases the filter bed area when compared with the conventional contact filter medium, and further, by setting the size of the chip filter medium It is a contact filter medium whose usage form can be arbitrarily selected. In addition, by filling and using the inside of the rectangular parallelepiped tank of the combined treatment septic tank and grease trap tank, the volume can be used effectively, the contact area can be increased, and the microorganism group can be propagated inside and outside the contact filter medium. Therefore, it is possible to efficiently purify sewage drainage by increasing the decomposition action of organic matter and oil.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1: shows the schematic block diagram of the merger processing septic tank and grease trap tank which used the thinning material concerning embodiment of this invention as a filter medium.
As shown in FIGS. 1 and 2, the merged treatment septic tank according to this embodiment is a merged tank through a water supply pipe 3 by a crushing submersible pump 2 installed in a flow rate adjusting tank 1 into which miscellaneous wastewater and oily food wastewater are introduced. It flows into the main body 4. The wastewater that has flowed in through the water supply pipe 3 sequentially flows into the cylindrical pipe 15 through the water supply connection pipes 16, 17, 19, 20, 22, 23, 25, 26, 28, and 29 through the invert 7. It passes through the cylindrical tube 15 and passes through the thinned chip filter medium 8. Further, the drainage passes through the tip filter medium 38 through the inflow hole 30 provided in the cylindrical tube 45 of FIG. 3 and is stored in the lower portion, thereby promoting purification. The purified waste water is configured to flow into the storage tank 12 through the drain hole 10 in the lower part of the partition plate 9 and to be sent from the drain pump 11 to the disinfection tank 13.

FIG. 2 is a plan view of the merged treatment septic tank and grease trap tank used in the present embodiment.
The water / liquid amount inspection port 5 is an inspection port for the amount of water / liquid and the inlet for the chip filter medium, and the chip input port 6 is an inlet for the chip filter medium into the combined tank and the grease trap tank. In order to replenish the chip filter medium due to the aging of the contact filter medium, it is installed at 10 places on the left and right sides in the direction of the drainage side water supply connecting pipe 29.

FIG. 3 is a cylindrical tube diagram used in this embodiment.
Ten were installed in the merge tank 4 of FIG. The chip filter medium 38 is filled into the cylindrical tube 45 of FIG. It is desirable to use a tube having a diameter of 100 mm to 200 mm as the cylindrical tube 45 depending on the daily amount of drainage. In addition, an outflow hole 30 having a diameter of 20 mm to 30 mm is provided in the cylindrical tube 45 from the lower part of the water / liquid amount inspection port 35 by 300 mm.

  FIG. 4 is a plan view of the chip filter medium 38 used in this embodiment.

  FIG. 5 is a cross-sectional view of the chip filter medium 38 used in the present embodiment.

  The chip filter medium 38 of FIGS. 4 and 5 is obtained by cutting a thinned material into a length of about 1 m and crushing it into a chip shape having a thickness of 1.5 cm and a length of 5 to 7 cm through a wood crusher.

The merged treatment purification tank and grease trap tank according to this embodiment are configured as shown in FIGS. 1, 2, and 3 and function as follows.
In this embodiment, first, general wastewater and miscellaneous wastewater discharged from food-related facilities and wastewater with high slurry concentration and oil concentration are pumped from a crushing submersible pump 2 installed in one flow control tank, and a water pipe 3 through the invert 7 through the water feed connecting pipes 16 to 29 to the respective cylindrical pipes 15. At this time, after drainage is submerged in the tip filter medium 8 of the left and right cylindrical tubes 15 connected to the invert 7 on the water supply pipe 3 side, the drainage side is sequentially shifted to purify.

  The water level stored in the chip filter medium 8 and the cylindrical tube 15 filled in the merged tank 4 is almost equal to the amount of water. The lower part where the drainage is flooded becomes an anaerobic filter medium and promotes solid-liquid separation. An anaerobic and aerobic filter bed is formed at the interface and at the top of the interface. This bacteria breeding improves the purification efficiency function. The volume of the chip filter medium 8 filled in the merged tank body 4 has a contact area several times as large as the surface area of the filter medium processed with plastics, nonwoven fabrics, synthetic fibers and the like that have been conventionally used. The residence time and contact time inside the merged tank and grease trap tank are also equivalent, and it becomes possible to promote the decomposition of BOD, COD, and oil.

The cause of the bad odor of various wastewaters is that organic matter contained in the wastewater changes due to decomposition by anaerobic bacteria and decays. Malodorous substances such as methylcaptans, which are sulfur compounds generated at this time, and ammonia, amines, which are nitrogen compounds, are decomposed into N (nitrogen), S (sulfur), CO ₂ (carbon dioxide), and H ₂ O (water). The Oxygen is required in the process of bacterial propagation, but wastewater etc. passes through the chip filter medium as it is pumped and flows into the combined treatment tank, and the inside of the chip filter medium becomes anaerobic and wastewater drainage passes. As it goes, oxygen is taken into the inside by replacing it with sewage, and it changes to aerobic. By repeating the steps of fermentation, decomposition, digestion, and extinction by repeating this anaerobic and aerobic treatment, purification and deodorization treatment can be performed.

  For odor concentration, ammonia and hydrogen sulfide, the values before and after pumping up

Table 1

Was measured as follows.

In addition, in the merger treatment septic tank from 5 tanks to 20 tanks, as a result of changing the thinning chip filter medium by the quantity of 5m ^{3 to} 20m ³ (JISK0102-21), about 98% of the basic value of BOD 250ppm was removed. .

  The present invention uses a thinning chip material, which is a local resource, and uses a thinning chip material as a filtering material, and uses a cylindrical pipe inside the tank, thereby providing an optimum filter bed space for bacteria by the action of oxygen, temperature, moisture, etc. The most natural and environment-friendly combined treatment septic tank and grease trap tank that can be given.

  For wastewater from general domestic wastewater and food related facilities, there is no settling tank, contact tank, settling chamber, etc. It is possible to decompose aerobic bacteria and provide a combined tank and a grease trap tank with high deodorizing effect and high purification efficiency. It can also be an effective use of thinned wood. And it becomes possible to perform more effective waste water purification processing efficiently by combining with each treatment of various waste waters, such as general domestic waste water, food related facilities, and livestock related. By discharging this treated water, it is possible to prevent eutrophication of water, which is currently a cause of pollution in rivers and lakes.

Configuration diagram of merger processing septic tank and grease trap tank Top view of merger processing septic tank and grease trap tank Cylindrical pipe diagram Top view of chip filter media Cross section of chip filter media

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow control tank 2 Crushing type submersible pump 3 Water supply pipe 4 Combined tank main body 5, 35 Water liquid amount inspection port 6 Chip inlet 7 Invert 8, 38 Chip filter medium 9 Partition plate 10 Drain hole 11 Drain pump 12 Storage tank 13 Disinfection tank 14 Drain pipe 15, 45 Cylindrical pipe 16, 17, 18, 19, 20,
21, 22, 23, 24, 26,
26, 27, 28, 29 Connecting water pipe 30 Outflow hole

Claims (4)

  A contact filter medium comprising a filter bed for crushing thinned wood into chips and promoting the growth of aerobic, aerobic and anaerobic microorganisms.   A cylindrical pipe is provided with a plurality of holes, and the lower part of the cylindrical pipe is filled with the contact filter medium according to claim 1, so that the wastewater and miscellaneous drainage permeate, thereby improving the efficiency of decomposition of the wastewater and miscellaneous drainage. A cylindrical pipe characterized by that.   A plurality of pipes of 10 to 10 are fixedly installed in parallel in the merged tank inside the merged tank, sewage and miscellaneous drainage permeate the pipe, and the contact filter medium of claim 1 is filled inside the merged tank. And the combined treatment purification apparatus characterized by improving the decomposition processing efficiency of sewage and miscellaneous drainage by allowing miscellaneous drainage to permeate.   A plurality of the pipes of claim 2 are fixedly installed in parallel in the grease trap tank, and the food wastewater having a high slurry property and containing a large amount of oil discharged from food-related facilities permeates the pipe. Moreover, the grease trap tank is filled with the contact filter medium according to claim 1 to allow food wastewater sewage and miscellaneous drainage to pass through, thereby improving the decomposition treatment efficiency.

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